Goods are sold with money-back guarantee.

售出商品质量不符保证退款。

Is there a money-back guarantee?

有保证退钱吗？

I don't recall seeing a money-back guarantee.

我不记得有过资金回收的保证。

Finally, shop at a store that offers a money-back guarantee.

最后，要在提供有退款保证的商店购买。

You understand there is an 8 week, money-back guarantee.

你知道有一个8周，清退款保证。